Pictures of Penn Station in New York City and 30th Street Station in Philadelphia
These are the stairs that lead down from the 7th Ave entrance to Penn Station. Penn Station is in a basement basically. These are from the bottom of the stairs looking up. The on stair advertising is fairly new, been there for about 3 years I'd say. It was not there when I started my commute from Philly to NYC in 2004. There's a long hallway leading to these stairs from the train platforms so you get a good look at whatever ad is there.
30th Street train status board